zyxel wap 3205 - number of wireless clients limitation

Zyxel WAP 3205 can work in "wireless access point" mode.

When its firmware was version: V1.00(BFR.2), it could accept only 15 wireless clients.  But after I have upgraded its firmware to be version: 1.00(BFR.6)C0, I can now see 27 wireless clients.  It could be more.  I just don't have more computers to test.